Before I have complete the test for emC, I have written an article about #mutex and #waitNotify or #waitSignal: https://vishia.org/emc/html/OSHAL/MutexNotify.html The emC test contains some test cases of then, see src/test/cpp/emC_Test_Threads/Test_ThreadMutexNotify_emC.c in the emC github https://github.com/JzHartmut/Test_emC/tags 2023-01-28